I still can't believe that in this era, people are difficult to update their information about something like Bitcoin although the are too many sources to get the information.
The fact that information exists online means absolutely nothing if the average person cannot understand it - and we see that at least 50% have admitted indirectly that they do not understand Bitcoin no matter how someone tries to explain it to them. You may be unaware (though not relevant to the topic) that 40% of the world's population still does not have access to the Internet...
The problem is not that it is difficult to get information about bitcoin in our time, but that people may not have the desire to look for this information and the most common laziness.
I think many will agree with me that people are different: Some, with their diligence, get what they want, be it information or something material. Others, even with all the possibilities, for example, the presence of internet and access to info about bitcoin, under no circumstances do even minimal actions to study info about it. Therefore, it seems to me that in the form that bitcoin now exists, never 100 % of the world's population will not use it. This will require greatly simplifying everything for the benefit of users (as suggested by
Square, for example), but the question is whether bitcoin will remain the same after that.
You also correctly noticed that many people don't physically have access to internet. Of course, with the development of technology, their number is decreasing, but still, not so fast due to hard-to-reach locations. I would also like to draw attention to the level of PC proficiency and the lack of it. Even now, when a PC is relatively cheap, not everyone has it, which also prevents bitcoin's spread. You can also add those people who have a PC at their disposal, but the level of ownership of this still doesn't allow them to start recognizing and using bitcoin. Although the widespread use of smartphones may partly compensate for this, but you understand that this is a completely different level of security and safety of funds.